docs: def call(self, code, line, callee_file_timing, callee, duration, frame):
          """
          A call originating from this file returned.
  
          code (code)
            caller's code object
          line (int)
            caller's line number
          callee_file_timing (FileTiming)
            callee's FileTiming
          callee (code)
            callee's code object
          duration (float)
            duration of the call, in seconds
          frame (frame)
            calle's entire frame as of its return
          """
          try:
              entry = self.call_dict[(code, line, callee)]
          except KeyError:
              self.call_dict[(code, line, callee)] = [callee_file_timing, 1, duration]
          else:
              entry[1] += 1
              entry[2] += duration